There was a 3rd party app floating around at one time called Folder Lock I believe that would do what you want, but I don't believe it's been updated in quite some time. Ani is currently beta testing an app called 'AppLock' that looks like it will finally allow us to lock certain functions on the device without crippling it altogether, but it's currently in the beta stage.

Lol@Greggebhardt. Boys. Always gotta think evrything is naughty. Tsk tk. The app suggested by strawder is a good app. I look forard to the new app coming out. ^^ such a shame kids these days don't have more repspect for themselves than that.BlackBerry9000/4.6.0.167 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102